Electrical Engineering

DC Series motor should never run without load connected to it because starting torque for DC series motor is infinite and running it on no load will damage the motor due to overspeeding.

to step up voltage or to step down voltage

Fuzhou Landtop Corporation Limited, China

That means either there is a load (appliance or fixture) connected in the circuit that has a short and it needs disconnected before trying to reset. Or the breaker itself has gone bad and needs replaced.

a transformer

From ohms law, I = V/R hence Voltage and Resistance can affect the value of current, both peak and average.

Also with a rectifier circuit other factors can affect the peak current such as frequency and capacitance

Craig - AUT

As the motor is a three phase machine,it must be AC supply

because it is necessary to provide an over load protection ,surge protection,etc....hence an transformer is used...( particularly isolated transformers)

0V, I belive, since all voltage calculations are referenced against the reference node. (Been I while since I took EE201, though.)

This solution may not be suitable for all... but for some you can use this.. it's just that you need to first simplify the circuit using source transformation and reduce the given network to a current source in parallel or a voltage source in series.... and the resultant resistance is the thevin or norton resistance and that current or voltage source is the equivalent thevin voltage or norton current.

You could try doing your own homework and learning how to solve it for yourself the way your teacher taught you!

It is impossible for a series circuit to have two points with two different currents. Kirchoff's Current Law states that the signed sum of the currents entering a node is zero. A consequence of this is that the current in every part of a series circuit is the same.

Please restate the question, giving correct information.

Many generator parts are made in China and Taiwan. Mainland China's thriving manufacturing sector has attracted a large segment of the businesses that create these component pieces.

An induction motor has an AC power source applied to the stator and an AC source applied to the rotor, through slip rings. The rotor spins a sub synchronous speed, which creates the phase shift between rotor AC and stator AC. This phase shift (known as slip) is what creates the torque.

Yes. As long as the load stays the same. Voltage equals the resistance of the load times the current or amperage. Or , in this case, as an example, if the load is the same, the voltage is 240 and current is 10 amps. At 120 volts, the current is 20 amps. Current x resistance(or the load)=voltage. With simple math, the equation can be moved around.

In electronics, a common-emitter amplifier is one of three basic single-stage bipolar-junction-transistor (BJT) amplifier topologies, typically used as a voltage amplifier. In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both, hence its name. An analogous circuit called the common source is constructed using field-effect transistors Common-emitter amplifiers generally have a very high gain which can vary widely from one transistor to the next, as it is a strong function of both temperature and bias current, making the actual gain unpredictable. Stability is another problem associated with such high gain circuits, due to any unintentional positive feedback that may be present. Other problems associated with the circuit are the low input dynamic range imposed by the small-signal limit and the high distortion resulting if this is exceeded. One common way of alleviating these issues is with the use of negative feedback, particularly with emitter degeneration. Emitter degeneration typically refers to the addition of a small resistor (or any impedance) between the emitter of the transistor and ground. The effect of this is to reduce the overall transconductance Gm = gm of the circuit by a factor of gmRE + 1, making the voltage gain depend more on the ratio of the resistors than the transistor's characteristics: The distortion and stability characteristics of the circuit are thus improved, but at the expense of a reduction in gain. Common-emitter circuits are used to amplify weak voltage signals, such as the faint radio signals detected by an antenna. When used in radio frequency circuits, it is common to replace the load resistor with a tuned circuit. This is done to limit the bandwidth to a narrow band centered around the intended operating frequency. More importantly it also allows the circuit to operate at higher frequencies as the tuned circuit can be used to resonate any inter-electrode and stray capacitances, which normally limit the frequency response. Common emitters are also commonly used as low noise amplifiers. At low frequencies and using a simplified Hybrid-Pi model, the following small signal characteristics can be derived. If the emitter degeneration resistor is not present, RE = 0 Ω. According to these formulas and in agreement with the previous discussion, when RE is increased the input resistance is increased and the gain is reduced. {| ! ! Definition ! Expression ! Current gain ! Voltage gain ! Input resistance ! Output resistance |} The bandwidth of the common emitter amplifier tends to be low, due to high capacitance resulting from the Miller effect. The base-collector capacitance is effectively multiplied by the factor 1 − Av, thus increasing the total input capacitance and lowering the overall bandwidth. The discussion of bandwidth parallels that in the article on the common source amplifier. A fix for this bandwidth problem is the cascode amplifier. == ==

1/(2 Pi sqrt(LC))

Telecommunications. Same meaning with patch board, an electrical panel with numerous sockets into which electrical cords can be plugged to form temporary circuits.

you could have a loose connection causing it to arc enough to trip the breaker -- check all the connections -- maybe you'll need to change out the arc fault

you could have a loose connection causing it to arc enough to trip the breaker -- check all the connections -- maybe you'll need to change out the arc fault

The actual writing and delivery of the appraisal is typically performed by the employee's direct or immediate supervisor/manager. That said, depending on the company's philisophy and structure, the supervisor/manager may ask the employee's coworkers and other managers who work with the employee for feedback on the employee's performance as well.

A parallel circuit will not effect the other bulb. If the bulbs are in a series circuit the other bulb will not turn on.

Power is current times voltage, so a current of 0.5 amperes and a voltage of 220v across a bulb will yield a power of 110 watts.

500 miles long

First of all find out what voltage the motor is designed to work on.

The main advantage of ac- it required less maintainance

The main disadvantage of ac-it can not be stored

the main advantage of dc -it required less amount of conductors to transmit and easily stored

The main disadvantage of dc-it is more dangerous than ac at high voltage